package com.yunlong.util;

/**
 * @author guorui
 * @date 2021-07-18 12:39
 */
public class StringUtil {
    public static boolean isNumeric(String str){
        for (int i = str.length();--i>=0;){
            if (!Character.isDigit(str.charAt(i))){
                return false;
            }
        }
        return true;
    }
}
